Some Samsung users are complaining that their smartphones randomly sent photos and scheduled texts to contacts. According to posts on Reddit and Samsung’s official support boards first spotted by Gizmodo, the devices affected include the Galaxy S9 and Galaxy Note 8. Their owners say that Samsung Messages, the default texting app for Galaxy devices, pushed photos and scheduled texts to random contacts, but left no record of the messages being sent.

One Reddit user says his Galaxy S9+ sent his entire photo library to a contact in the middle of the night while he was asleep (fortunately, that contact was his partner). The poster says that even though there was no evidence of the mass photo sharing in Samsung Messages, it showed up on his T-Mobile logs. He also added that he has never used the Shared tab in Samsung Gallery app, which lets users send photos through messaging apps, email or social media without leaving their photo gallery.

The issue also appears to be affecting some text messages. On Samsung’s Galaxy S9 support board, a user said Samsung Messages became buggy after an T-Mobile RCS/advanced messaging update on his phone. Errors included scheduled text messages ending up in the wrong threads.

Many complaints posted online are from people who said they are T-Mobile customers and recently updated Samsung Messages, leading to a theory that the issue may have been triggered by the carrier’s recent RCS (Rich Communication Services) updates. RCS is supposed to improve texting by adding features like group chat, video and GIF support and file and location sharing. Since several accounts said photos had been randomly sent to partners or family members, there is also speculation that the problem affects shared plans.

In a statement, a Samsung spokesperson said “We are aware of the reports regarding this matter and our technical teams are looking into it. Concerned customers are encouraged to contact us directly at 1-800-SAMSUNG.” Rare Norm has also reached out to T-Mobile for comment. The carrier told Gizmodo that “it’s not a T-mobile issues” and asked users to contact Samsung.

There are currently two fixes if you are worried about the issue affecting your device. First, you can go into its app settings and revoke Samsung Message’s ability to access your storage, which means it won’t be able to send anything stored on your phone, including photos. This may be a pain, however, because it means if you do want to send photos or files through the app, you need to restore permission in settings again. The second fix is to stop using Samsung Messages until the company says the issue has been resolved and switch to a third-party messaging app instead.